Apparatus for attaching holding devices to lenses while such lenses are being shaped and edged.



N0. 691,2l8. Patented Jan. l4, I902. J. WEST. APPARATUS FOR ATTAGHING HOLDING DEVICES TD LENSES WHILE SUCH LENSES ARE BEING SHAPED AND EDGED.

(Application filed may 20,1901.)

2 Sheets-Sheet I.

(No Model.)

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No. 691,218. Patented Jan. l4, I902. J. WEST. v APPARATUS FOR ATTAGHING HOLDING DEVICES T0 LENSES WHILE SUCH LENSES ARE BEING SHAPED AND EDGED.

(Appiioation filed May 20, 1901.)

' 2 Sh6ets8heet 2.

(No Model.)

THE uunms Firms (20., Mn'rauma. WASHINGYON, D. c.

UNITED STATES PATENT OFFICE,

JAMES WEST, OF DALSTON, ENGLAND, ASSIGNOR OF TWO-THIRDS TO HENRY JOSEPH WILBERFOROE RAPHAEL, OF SHEPHERDS BUSH, MIDDLESEX COUNTY, ENGLAND, AND HERMANN LIONEL ETTINGHAUSEN, OF LON- DON, ENGLAND.

APPARATUS FOR ATTACHING HOLDING DEVICES TO LENSES WHILE SUCH LENSES ARE BEING SHAPED AND EDGED.

SPECIFICATION forming part of Letters Patent No. 691 ,218, dated January 14, 1902. Application filed May 20, 1901. Serial No. 61,136. (No model.)

To aZZ whom it may concern: necessary that the dops should be not only Be it known that I, JAMES WEST, a subject accurately attached to the lens in relation to of the King of Great Britain, residing at Dalthe focal center of the latter, but that they ston, in the county of Middlesex, England, should be also attached in accurate relation 5 have invented a certain new and useful Imto each other. For this purpose I use apair provement in Apparatus for Attaching Holdof what I call parallel tongs-that is to ing Devices to Lenses While Such Lenses are say, a pair of tongs whose two jaws move par- Being Shaped and Edged, of which the followallel to and from each other, as shown in the ing is a specification. drawings. These parallel tongs are shown in 10 My invention relates to an improved device the accompanying I drawings and are conby which lenses which are to be ground and structed in the following manner-that is to edged (in the machine which is fully set forth say, the parallel bars a and b of these tongs and claimed in my concurrent application, are united through the medium of two pairs -SerialNo. 61,137, filedMay20, 1901) have supof cross-links, whereof c d and e f are the 15 ports or dops, by which they are carried in members, jointed at g g, h h, and i z".

the said machine, affixed to them upon both Pins j j pass transversely through the slots sides, so that they are perfectly, truly, and 3' 3 in the bars a and b and unite the free accurately adjusted and fixed and in a very ends of the links 0 d and e f, so as to enshort time. I attain these objects by the able them to move in unison. During any 20 means illustrated in the accompanying drawmovement of the bars a and b, the pins j and ings, in which-' I j slide in the slots 7' and 7' A trunnion-pin Figure 1 represents a side view of the 'ad- 7c passes (at k and k transversely through j Listing-tongs. Fig. 2 represents aplan of the the links 0 d and cf, which are freely jointed same. Fig. 3 represents a front elevation of upon-the pin. The jaws Z Z, forming the nose 2 5 the same. Fig. drepresents a side view, and of the bars a and b, are provided with short Fig. orepresents a plan, of the standard which pieces or strips of metal I I" of a dovetailed is used in conjunction with the tongs. Fig. shape in transverse section to allow the dops 6 shows a side view and a plan of one of the to fit and slide upon them from the front end dops. Fig. 7shows two side views audaplan and to become more or less securely held 30 of these dops attached to each side of the lens. while the tongs are being used. A handle an Similarlctters refert-o similar parts throughis attached through the medium of the bent out. tang m to the end of the bar I), while another According to this invention the pieces which bent tang m attached to the bar a, crosses it is proposed to attach to the lenses for the at the side of the tang m and is brought down 3 5 purpose of holding them while they are being to a convenient point where it terminates and shapedandedgedand whicharecalleddops is capable of being controlled by the foreare of the construction and shape shown in finger of the operator. Two guides at and n Fig. 6 of the accompanying drawings. I serve to keep the bars aandb moreaccurately prefer, for the reason hereinafter explained, in alinement with each other, while springs 40 to attach two of these dops to each lens-that n and u keep the bars a and b pressed tois to say, one on each face-in the manner gether and cause the tongs to close when the shown in Fig. 7, wherein 0 is the lens, and p 0' pressure of the forefinger of the operator is the dops. In conjunction with the dops I released or removed. use pitch or any other suitable substance for Figs. 4 and 5 represent a standard used in 4.5 the purpose of making them adhere firmly conjunction with the above tongs and necand securely to the lens. essary for determining the correct position o In order that the focal center of the lens of the ton-gs in relation to the lens at the may coincide with the I geometrical center moment of attaching the dops to the latter. when the said lens is edged and finished, it is This standard is fixed opposite to an orifice in the centering apparatus by which the focal center of the lens is ascertained andwhich is fully set forth and claimed in my'concurrent application, Serial No. 61,135, filed May 20, 1901. This centering apparatus consists of two cylindrical tubes arranged one above the other accurately in line with each other and having their adjoining ends accurately faced and at right angles to the center line of the tubes, the upper tube being capable of sliding vertically in a guide and the lower tube being carried in a fixed guide or socket, the lens being placed between the adjoining ends of the tubes and being adjusted by hand' until it is uniformly bedded between them, its center thus corresponding with the center of the tubes. The orifice described is made in the side of both tubes-that is to say, partly in the lower end of the upper tube and partly in the upper end of the lower tube. The relative positions of the standard and the centering apparatus are shown in Figs. 1 and 2, in which the tubes of the centering apparatus are shown in dotted lines and are also shown occupying their normal position in relation to the other apparatus.

a and a are two forked or Y bearings flared to receive the trunnion-piece 7c of the tongs hereinbefore described, whereby the said tongs are supported and otherwise held in a position relatively true with the lens. The forked and flared trunnion-bearings a and a are independently adjustable in the devices 2, while they are conjointly elevated or depressed in the adjustable device y by means of a screw 25, having a collar held and turning in the bottom of the guide 3 The screw screws into the bottom of the cylindrical part of the devices a, which are raised or lowered inthe guide gas the screw is turned. When adjusted to the exact height, the parts are firmly held by the clip and bolt to. The trunnion-bearings a and a and the devicez, which carries them, may also be made capableof a slight horizontal rotation in order to bring the nose of the tongs slightly obliquely to thecen terin g apparatus and in this way affix the dops slightlyoutthecenterofthelens. Thiswould produce what is termed decentering, as it causes, the optical center not to coincide exactly with thegeometrical center. This decentering is found advisable in order to compensate for the slightly-varying distance between the eyes of persons using the lenses in spectacles and the like. A lever-arm u is attached to the lower end of the screw 25 and moves over the dial L,WhlCl1 is grad uated,.so as toaccuratelymeasurethe amount of riseorfall of the trunnions. It will be seen, therefore, that the method of attaching the dops to the surface of the lens involves the use of the cen tering apparatus of the kind described above, in combination with the parallel tongs and the standard herein described, and consists as follows: The lens is carried to the said centering apparatus and having been centered is left securely held therein ready to receive the two dops which it is desired to attach. I now slide the two dops upon the dovetailed strips within the nose of the tongs herein described, having previously warmed the dops and applied hot pitch to their faces. I then open the tongs sufficiently and quickly enter the nose thereof into the orifice in the front of the tubes of the centering apparatus, carrying one dop above and one below the lens already held in readiness to receive them. I next see that the trunnion-pin has entered and come to rest in the forked and flared bearings a and a of the standard, which are adjusted exactly to the required height, and I then release the pressure of the forefinger, thereby allowing the tongs to close and bring the two dops into-contact with the lens. The lens with the two dops adhering to it may now be removed from the centering apparatus. For this purpose it is merely necessary to raise the upper cylindrical tube, when the tongs may be freely withdrawn, bringing the lens away with them. Taking the lens between his thumb and finger, the operator is now able to slide the whole bodily out from the mouth of the tongs and lay it aside. I affix two dops to each lens, as the subsequent operation of edging, as set forth in Letters Patent No. 629,634, requires that the lenses shall be reversed during the process.

Having fully described my invention, what I desire to claim and secure by Letters Patout isl. The apparatus for attaching holding devices to lenses, consisting of tongs having parallel moving jaws connected by jointed bars, and pressed together by springs, and operated by pressure upon a finger-bar, strips dovetailed in cross-section upon the opposite faces of the jaws, to receive corresponding dops or lens-holders,and atransverse trunnion passing through the centers of the j ointed bars where they cross each other, and adapted to fit accurately in bearings carried by a standard which receives the tongs, and which is itself arranged opposite to a suitable lens centering device, substantially as described.

2. In tongs of the character described, the combination of the parallel bars a, b, connected by cross-links 0, cl, and e, f, jointed at g, g, h, h, and 11, 2'; pins j,j, passing through slots 7' f, in the bars a, b; trunnion 7r; jaws Z, Z, provided with dovetail-shaped strips Z Z to receive dops to hold the lens, substantially as set forth and illustrated.

3. In tongs of thecharacter described, the combination of the standard carrying adjustable forked bearings a and a to receive the trunnion on the tongs and a guide y in which the bearings a, a can be conjointly elevated and depressed as desired, by the screw t, arm a, and graduated dial 7;, and fixed by the clip and bolt w, substantially as set forth and illustrated.

4. In tongs of the character described, the combination with a bar having a handle on IIO one end, a nose on the other end, and guides secured to said bar between the nose and handie; of a second bar adapted to move in said guides and having a nose at one end and a finger at the other end, cross-links pivoted at one of their ends to the said bars and at their other ends pivoted to slide on said bars, the said cross-links being pivoted together at their centers, and having trunnions, substantially as described.

5. In tongs of the character described, the

combination with a bar having a handle on one end, a nose on the other end, and guides secured to said bar between the nose and handle; of a second bar adapted to move in said JAMES WEST.

Witnesses:

ALFRED T. BRATTON, H. ARTHUR MARSHALL. 

